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Indian Navy Pilot The Human Eye and the Colourful World — practice questions

Explore 4 free The Human Eye and the Colourful World questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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The Human Eye and the Colourful World questions and exercises with answers

Showing questions 1–4 of 4.

The image of an object is formed on the:Read the answer and worked solution →Power of a corrective lens is expressed in dioptres. One dioptre equals:Read the answer and worked solution →Which of the following causes the colour of the clear sky to appear blue at noon?Read the answer and worked solution →The bluish colour scattered toward the sides of a sunbeam is described by:Read the answer and worked solution →

Worked practice questions

The image of an object is formed on the:

  1. Retina
  2. Pupil
  3. Cornea
  4. Iris
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Correct answer: A. Retina

1. Light entering the eye is focused by the cornea and lens. 2. The focused image lands on the retina at the back of the eye. 3. The retina contains photoreceptors (rods and cones). 4. So the image forms on the retina. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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Power of a corrective lens is expressed in dioptres. One dioptre equals:

  1. 1 per metre (m^-1)
  2. 1 metre
  3. 1 centimetre
  4. 1 newton per metre
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Correct answer: A. 1 per metre (m^-1)

1. Power of a lens is the reciprocal of its focal length in metres. 2. P = 1 / f, where f is in metres. 3. The SI unit of P is m^-1, which is called the dioptre (D). 4. So one dioptre equals 1 per metre. 5. A lens of f = 50 cm has power = 1 / 0.5 = 2 D. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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Which of the following causes the colour of the clear sky to appear blue at noon?

  1. Reflection from oceans
  2. Atmospheric dust in the standard view
  3. Absorption of red by air
  4. Selective scattering of shorter wavelengths
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Correct answer: D. Selective scattering of shorter wavelengths

1. Sunlight contains all visible colours. 2. Air molecules scatter shorter wavelengths much more than longer ones. 3. Blue light, being short, is scattered in all directions across the sky. 4. Observers receive this scattered blue light from every direction overhead. 5. The sky therefore looks blue. 6. So selective scattering of short wavelengths is the cause. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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